1 /**
2  * Copyright (C) 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 /** \addtogroup  RTP_Stack
18  *  @{
19  */
20 
21 #ifndef _RtpOsUtil_h_
22 #define _RtpOsUtil_h_
23 
24 #include <stdlib.h>
25 #include <RtpPfDatatypes.h>
26 
27 /**
28  * This is a wrapper class for os defined functions related to timestamp and network.
29  */
30 class RtpOsUtil
31 {
32 private:
33     RtpOsUtil();
34     ~RtpOsUtil();
35 
36 public:
37     /**
38      * It gets the Ntp time stamp
39      *
40      * @param pstNtpTime    Calculated NTP Timestamp
41      */
42     static RtpDt_Void GetNtpTime(tRTP_NTP_TIME& pstNtpTime);
43 
44     /**
45      *  Initializes pseudo-random number generator using system time as seed
46      */
47     static RtpDt_Void Srand();
48 
49     /**
50      * Generates a pseudo-random integral number using a new seed.
51      *
52      * @return Random number
53      */
54     static RtpDt_UInt32 Rand();
55 
56     /**
57      * converts the unsigned integer from network byte order to host byte order.
58      *
59      * @param uiNetlong Network byte order number
60      * @return host byte order converted number
61      */
62     static RtpDt_UInt32 Ntohl(RtpDt_UInt32 uiNetlong);
63 
64     /**
65      * It returns Random number between 0 and 1
66      *
67      * @return Generated random fraction
68      */
69     static RtpDt_Double RRand();
70 
71 };  // end RtpOsUtil
72 
73 #endif  // _RtpOsUtil_h_
74 
75 /** @}*/
76